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age 48
6.4 SPU status request (item QS)
The servo status request (item QS) consists of four bytes. Bytes 0, 1 and 2 are bit coded with information
about the level alarms, operational mode and general status. Byte 3 is an ASCII character that indicates the
active operational command.
Status byte 0: Status byte 1:
bit 0 : low level alarm bit 0 : displacer movement down
1 : low low level alarm 1 : displacer movement up
2 : high level alarm 2 : on level
3 : high high level alarm 3 : test flag
4 : motor limit switch low 4 : calibration test successful
5 : motor limit switch high 5 : calibration test failed
6 : 1 6 : 1
7 : 0 7 : 0
Status byte 2:
Active interface:
bit 0 : Active interface bit 0 bit 1 bit 0 Mode
1 : Active interface bit 1 0 0 I1
2 : dipped level 0 1 I2
3 : 0 1 0 I3
4 : general fail indication 1 1 dip
5 : no previous ST, WD or SD command
6 : 1
7 : 0
Status byte 3:
- : no command active N : interface profile
A : balance test L : lock test
B : Block M : measure frequency
C : calibrate R : tank profile
D : go down T : test gauge
F : freeze U : go up
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